121254-77012 Aftermarket Yanmar Starter Motor | Sawley's Select Marine Parts

🔧 Product Description

A 2.5kW 15-tooth Hitachi-pattern starter for Yanmar 4LH and 4LHA marine diesels. It supersedes 121254-77010 and 121254-77011 and was later replaced by 121254-77019.

⚙️ Key Features

• Marine-rated 12-volt starter construction

• Pinion, rotation and mounting pattern matched to the listed OEM family

• High-torque cranking output for reliable cold and warm starting

• Corrosion-resistant terminals and marine-duty internal components

• Direct replacement when the original OEM starter number matches

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 121254-77019 → Supersedes 121254-77012

• 121254-77012 → Supersedes 121254-77011

• 121254-77011 → Supersedes 121254-77010

OEM / Related Numbers:

• 121254-77012

• 121254-77011

• 121254-77010

• 121254-77019

• 129429-77010

• 129429-77011

• Hitachi S13-41

• Hitachi S13-41A

• Hitachi S13-41B

• Hitachi S13-41C

• Hitachi S13-41D

Aftermarket / Verified Equivalents:

• Recmar: REC121254-77012

• PSH / Cargo: 980.512.152.080

• WAI: 19839N

🚤 Compatibility

Commonly used on:

• Yanmar 4LH and 4LHA marine diesel starting systems

Typically suits:

• Engine models:

• Yanmar 4LH-DTE, 4LH-HTE, 4LH-STE and 4LH-TE

• Yanmar 4LHA-DTE and 4LHA-DTZ

• Yanmar 4LHA-HTE, 4LHA-HTZE and 4LHA-HTP

• Yanmar 4LHA-STE and 4LHA-STZE

• HP Range: Engine-rating specific; approximately 140HP-240HP

• Engine Type: Turbocharged inline-four marine diesel

• Year Range: 4LH/4LHA production; confirm by engine suffix

• Voltage: 12V

• Rated Power: Approximately 2.5kW

• Rotation: Clockwise viewed from the drive end

• Pinion: 15-tooth

• Original Manufacturer Pattern: Hitachi S13-41

🔌 Function

The starter motor converts battery power into mechanical cranking torque. When the solenoid is energised, the pinion engages the flywheel ring gear and rotates the crankshaft until the engine starts and the pinion disengages.

Common signs of failure:

• Starter clicks but does not crank the engine

• Slow or laboured cranking with a fully charged battery

• Pinion spins without engaging the flywheel

• Grinding, clashing or delayed disengagement at the ring gear

• Intermittent operation caused by worn brushes, armature or solenoid contacts

• Excessive heat, burnt odour or high current draw

📦 Condition

• Brand new aftermarket replacement part

• New and unused

• Supplied in manufacturer or equivalent protective packaging